Question about untether 4.21 jailbreak

have my Iphone 4 4.21 tether jailbroke from redsn0w and want to jailbreak with greenpoison now so it will be untethered. Do I need to restore the iphone first or can I run the greenpoison program with it already jailbroke? Also I have purchased lock info and bite sms will these show as free when I redownload them or what do I have to do to get them back without paying again. Thanks for any help!

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